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Subject: Power System Analysis
Topic: Unsymmetrical Fault Analysis:
Symmetrical Fault :
These faults involve only one or two phases.
In this type of fault ,three phase lines become unbalanced.
Those faults on the power system which gives rise to unsymmetrical fault currents(i.e, unequal line current with unequal phase displacement)are called Unsymmetrical fault.
Such fault occur between line to ground and two lines.
This type of fault mainly have two types
(a) shunt fault
(b) series fault.
Shunt faults are Single Line to Ground fault (L-G) Fault, Line to Line fault (L-L Fault),Line to Line To Ground fault(L-L-G) fault as shown in figure below.
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